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DRAWN BY : E Keerthika
APPROVED BY : Jay Neill
1. Use standard engineering practices to repair the damage on metallic surfaces.
2. Remove surface nicks on ball and stem by using a clean cloth.
3. Remove all corner damages by using a mild abrasive or with a bearing scraper.
4. Replace all faulty parts and components.
5. Flush lube and sealant while the valve is disassembled.
REASSEMBLY
BARE STEM VALVES-6" TO 12" (FP & RP) CLASS 150 TO 600
After inspecting the parts and getting the new replacement parts as required, use the following procedure to
assemble the below steps:
1. Place the body on the flange, on a clean solid surface so it will hold the weight of the assembled valve
securely. Attention should be given to the sealing surfaces not to damage.
2. If studs have been removed, install the studs in the body with the ID stamping up, and screw them down
completely by hand. Remove any particles which may have flaked off the studs.
3. Inspect the seats, paying careful attention to the insert sealing surfaces. Reject and replace all seats with
dings, scratches, or any other physical defects. Install the O-rings as shown in Fig. 3.0 Apply lubricant until
completely covering the O-rings.
4. Grease the seat pockets, install the springs in the spring holes and install the seats on their pockets. The
seats shall be lowered straight paying attention that the O-rings to engage correctly and all the springs are
in their holes. The seat shall be pressed in the pocket.
Note: Do not hammer the seat in the pocket; the springs my bounce out of holes and trapped
between seat back face and pocket outside the spring hole. The spring will be damaged when
the tail is bolt down destroying the entire seat.
DATE: 16-Sep-2020
DATE: 16-Sep-2020
Uncontrolled if Printed Without QA Stamp
15
Schlumberger-Private
Valves & Measurement
REVISION
TC-AOP-TR-D2-002
02
Page 15 of 24
Fig.3.0 Seat Detail for 6" to 12"
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